[1] UNIV NACL AUTONOMA MEXICO,CTR INVEST INGN GENET & BIOTECHNOL,DEPT BIOQUIM,APARTADO POSTAL 510-3,CUERNAVACA 62270,MORELOS,MEXICO
[2] NATL AUTONOMOUS UNIV MEXICO,INST INVEST BIOMED,DEPT BIOL MOLEC,MEXICO CITY 04510,DF,MEXICO
[3] INST MEXICANO PSIQUIATRIA,UNIDAD NEUROQUIM ANALIT,MEXICO CITY,MEXICO